单项选择题

In spite of the wide range of reading material specially designed or () for language learning purposes, there is yet no effective and systematic program for the reading skills.

A. appointed
B. assembled
C. acknowledged
D. adapted

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单项选择题
These two areas are similar()they both have a high rainfall during this season.

A. to that
B. besides that
C. in that
D. except that
单项选择题
Differences in positions adopted by oxygen and hydrogen atoms account for variations in the crystalline structure of different forms of ice.()

A. are caused by
B. explain
C. derive from
D. constitute
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